Synopsis:
   for ([<pre>],[<condition>],[<post>]) { <action> }

Description:
   FOR is a general purpose loop.  It is modeled on the C for statement,
   and works in a very similar manner.  Aside from the action, there are
   three parts to a FOR loop:

   * The "pre" part is executed before the loop begins iterating.  This is
     often used for initializing counters and other variables that will be
     used in the loop.

   * Before each loop iteration, the "condition" is checked.  Most often,
     this is used to see if the counter has exceeded a certain limit.  The
     condition may contain any expression legal in the IF command.
     Because of this, the loop does not necessarily have to iterate at all.

   * The "post" part is executed after the condition, if the condition
     returns true.  This is generally used to increment a counter that
     gets checked by the condition statement.

   Multiple commands may be used in each part; they must be separated by
   semicolons (giving it something of a reverse-C syntax).  Note that
   there does not necessarily need to be any commands in any part.  The
   action is optional as well.

Examples:
   To display a warning message 3 times:
      for ( @ xx = 3, xx > 0, @ xx-- ) {
         echo WARNING!  This ship will self destruct in $xx seconds!
      }

   A infinite loop that behaves like the Unix 'yes' command:
      for ( ,, ) {
         echo yes
      }

See Also:
   fe(5); fec(5); foreach(5); until(5); while(5)